Active Level Keto It is estimated that around 20 percent of the population may be deficient in one IgG subtype. IgG2 deficiency is most common in children and IgG3 in adults.Type G (IgG) immunoglobulins - diagnostic tests using IgG antibodiesIgG antibodies are commonly used for laboratory tests. Such antibodies are obtained in laboratory conditions and are called monoclonal antibodies . They come from one cell clone and are directed against one specific antigen.The basic method of producing monoclonal antibodies uses laboratory mice http://www.crystalmccraryanthony.com